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Match a portable air cleaner CADR to room size

Compare room area and ceiling height with CADR, then check gas filters, noise and costs.

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US EPA

Official source: Match a portable air cleaner CADR to room size

Link card to US EPA guidance

EPA explains that CADR measures particle cleaning and no air cleaner removes every pollutant.

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1. Measure length × width; include connected open-plan space.
2. Compare labeled CADR with floor area; EPA's chart assumes roughly 2.44-m ceilings.
3. For fine particles, check a small-particle CADR such as tobacco smoke.
4. For odors or gases, check dedicated activated-carbon media; particle CADR does not rate gas removal.
5. Keep air inlets and outlets clear of curtains; assess noise at usable fan speeds.
6. Check replacement-filter cost, avoid deliberate ozone emission and maintain ventilation.